Optimistic female Determinator. Plucky means "brave and optimistic". You might be able to pile life complications onto this young woman/girl, to the point where the audience would forgive her if she just refused to go on. She might even have an episode or so where she does throw in the towel, because human beings can only take so much of what the universe is handing out for her. But the Plucky Girl always comes back. That's the bravery part. The optimistic part is the rest of it.